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CN104718366A - Exhaust gas purification system and exhaust gas purification method - Google Patents

Exhaust gas purification system and exhaust gas purification method Download PDF

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Publication number
CN104718366A
CN104718366A CN201380052633.0A CN201380052633A CN104718366A CN 104718366 A CN104718366 A CN 104718366A CN 201380052633 A CN201380052633 A CN 201380052633A CN 104718366 A CN104718366 A CN 104718366A
Authority
CN
China
Prior art keywords
temperature
waste gas
exhaust gas
control
catalyst
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201380052633.0A
Other languages
Chinese (zh)
Other versions
CN104718366B (en
Inventor
长冈大治
中田辉男
是永智宏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
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Filing date
Publication date
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Publication of CN104718366A publication Critical patent/CN104718366A/en
Application granted granted Critical
Publication of CN104718366B publication Critical patent/CN104718366B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/36—Arrangements for supply of additional fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402—Multiple injections
    • F02D41/405—Multiple injections with post injections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/08—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing
    • F01N2430/085—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by modifying ignition or injection timing at least a part of the injection taking place during expansion or exhaust stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
    • F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0408—Methods of control or diagnosing using a feed-back loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1404—Exhaust gas temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1621—Catalyst conversion efficiency
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1626—Catalyst activation temperature
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/103—Oxidation catalysts for HC and CO only
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    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/021—Engine temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
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    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
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    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
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    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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Abstract

An exhaust gas purification system and an exhaust gas purification method. Exhaust gas (G) from an internal combustion engine (11) is passed through an exhaust gas purification device (20) after passing through a pre-oxidation catalyst (25). If a first temperature (T1) of the exhaust gas (G) on the upstream side of the exhaust gas purification device (20) is lower than a first set temperature (T1c), then multistage temperature-increasing injection is performed, and when the first temperature (T1) is at least as high the first set temperature (T1c), post injection is performed in addition to multistage temperature-increasing injection. The post injection is subjected to feedback control so that a second temperature (T2) of the exhaust gas (G) on the downstream side of the exhaust gas purification device (20) is the same as a second set temperature (T2c). By virtue of this, NOx purification characteristics at low temperatures are improved and generation of white smoke and the like due to HC slip during DPF regeneration at low temperatures is prevented by installing the pre-oxidation catalyst (25) upstream of the exhaust gas purification device (20) that comprises a first stage oxidation catalyst (21) and controlling fuel injection in multistage temperature-increasing injection and post injection.

Description

Waste gas cleaning system and exhaust gas purifying method
Technical field
The present invention relates to waste gas cleaning system and exhaust gas purifying method, can improve the low-temperature characteristics of the waste gas cleaning plant possessing prime oxidation catalyst and the side at least in NOx purification catalyst or DPF, and NOx removal when can improve low temperature, prevent the generation of white cigarette.
Background technique
In the internal-combustion engine such as diesel engine, a part of petrol engine, in order to reduce NOx (nitrogen oxide), the PM (particle-like substance) in waste gas, and use NOx purification catalyst (deNOx catalyzer), DPF (diesel particulate filter).
As this NOx purification catalyst, there are rare NOx trap catalyst (LNT catalyzer) and selective reduction type catalyzer (SCR catalyst) etc., there is NOx storage-reduction catalyst as one of this rare NOx trap catalyst.This NOx storage-reduction catalyst is carried with the NOx occluded material of occlusion NOx and the catalyzer of precious metal, is rare (hyperoxia) state and oxygen (O in atmosphere in the air fuel ratio of waste gas flowed into 2) concentration higher when, the nitrous oxide (NO) in waste gas is oxidized and become nitrogen dioxide (NO on precious metal 2), the NOx occluded material such as this nitrogen dioxide and barium (Ba) are combined into as nitrate (Ba 2nO 4) etc. and by occlusion.
In addition, the air fuel ratio of the waste gas that this NOx storage-reduction catalyst of present dynasty flows into becomes chemically correct fuel, dense (low oxygen concentration) state, when oxygen concentration in atmosphere reduces, NOx occluded material and carbon monoxide (CO) combine, nitrates decompose and discharge nitrogen dioxide.The nitrogen dioxide of this release is become nitrogen (N by three meta functions of precious metal by reduction such as unburned hydrocarbon (HC), carbon monoxide etc. contained in waste gas 2), each composition in waste gas is as carbon dioxide (CO 2), water (H 2o) material that, nitrogen etc. are harmless and discharging in air.
Therefore, in the waste gas cleaning system possessing NOx storage-reduction catalyst, when NOx occlusion capacity is close to time saturated, the dense control that the control oxygen concentration of the waste gas of inflow being reduced by carrying out making the air fuel ratio of waste gas become dense state, i.e. NOx occlusion capacity recover, carries out making absorbed NOx release and making the NOx of this release be reduced to the NOx regenerative operation of nitrogen by precious metal thus.
With this NOx storage-reduction catalyst for representative, in the ordinary course of things, when catalyzer does not become more than activation temperature, its catalyst action does not activate, therefore there are the following problems: when the low temperature that catalyzer does not activate, cannot react by promoting catalyst, NOx removal step-down in the NOx purification catalyst such as NOx storage-reduction catalyst, selective reduction type catalyzer.
The NOx removal of catalyzer during in order to improve this low temperature, also controls to discuss to the intensification of waste gas in the waste gas treatment of diesel engine.It is following control that this intensification controls: by combination and stepped heating injection (multi-stage jet) of pre-spray (pilot injection), main injection (main injection), delayed injection etc., the combustion temperature of (in cylinder) in the cylinder of expansion stroke later for piston top dead center is remained high temperature, and the control that exhaust gas temperature is heated up.Controlled by this intensification, exhaust gas temperature can be made to heat up ahead of time, and accelerate the activity being disposed in the catalyzer of the waste gas cleaning plant of exhaust passageway.
In addition, in the waste gas cleaning system of DPF possessing the PM in trap exhaust, when PM amount of collected close to DPF can amount of collected (amount of saturation state) time, in order to recover its PM trapping ability, and the PM Regeneration control carrying out more than the temperature taken fire by the PM that the temperature of DPF extremely traps and PM burning is removed.When the intensification of this DPF, the waste gas carrying out making to flow into towards DPF is heated up and is controlled by the intensification that the waste gas of high temperature makes DPF heat up.
But, in the intensification control of the waste gas when cold, there is following situation: the fuel that the intensification of being sprayed by stepped heating is controlled and is ejected in cylinder almost all at in-cylinder combustion, but burns surplus unburned hydrocarbon (HC) directly through waste gas cleaning plant.Namely, when the intensification carrying out waste gas controls, when the temperature of the catalyzer being arranged at exhaust passageway is below catalyst activation temperature, there are the following problems: the unburned hydrocarbon of discharging in cylinder arrives the aftermost rear tail pipe of exhaust passageway, and in air, flow out (leakage) and discharge into the atmosphere.
The NOx of the situation not only when the cold of NOx purification catalyst, NOx storage-reduction catalyst regenerates, and the PM to DPF when motor is low load carry out burn removing PM regeneration, too exist produce this HC leak possibility.
Such as, described in Japanese publication JP 2010-31833 publication, a kind of Exhaust gas purifying device of diesel engine is proposed, in order to reduce this HC (hydrocarbon) towards the release in air, in the formation by prime oxidation catalyst (DOC) and DPF, carry out based on rear DOC intensification of spraying (early-post injection) in advance, and based on by prolonging in waste gas cleaning plant that the DPF not firing the oxidation reaction heat of composition in DOC that late injection (delay-post injection) supplies heats up, be there is by emitted dose after making target delay the delay of certain hour, suppression is prolonged the sharply rising of the emitted dose of late injection and prevents HC from leaking thus.
But when using this DOC, need the operation range covering internal-combustion engine overall to the DOC that composition (not firing HC) is oxidized that do not fire in waste gas, being therefore difficult to miniaturization, there is the limit in this situation of vicinity being arranged at engine main body.In addition, when using outlet pipe inner direct, the gasification of the fuel sprayed needs the regular hour, and, when interval between HC injection valve nozzle (outlet pipe inner direct device) and DOC is narrower, sometimes produce carbon black due to the partial oxidation (cracking) of fuel and produce blocking before DOC, therefore needing the interval between increase HC jet nozzles and DOC, such as become more than 1m.
Based on these reasons, cannot DOC be configured near engine main body, the waste gas of therefore discharging in cylinder arrival DOC before due to heat radiation temperature step-down.Therefore, when low temperature, cannot by not firing HC in DOC fully oxidation gaseous effluent, and HC can be produced leak.
As the countermeasure that HC during this low temperature leaks, such as, described in Japanese publication JP 2011-163250 publication, the waste gas processing method and the device that have internal-combustion engine are proposed, in the formation by prime oxidation catalyst (DOC) and DPF, carry out based on rear DOC intensification of spraying in advance, and based on by prolong late injection supply do not fire the oxidation reaction heat of composition in DOC DPF heat up waste gas cleaning plant in, during spraying in advance afterwards afterwards to DOC reaches active temperature, discharge in a large number towards the outside to prevent not firing HC composition, and before starting to spray in advance, increase the power of oil circulating pump, the load of diesel engine is made to increase thus, the waste gas intensification gradient of DOC temperature rise period is increased, and promote the activation of DOC, reduce HC to leak.But in this waste gas processing method and device, when cold-starting, increase the load of diesel engine to make the cylinder temperature of internal-combustion engine heat up, therefore specific fuel consumption likely worsens.
Prior art document
Patent documentation
Patent documentation 1: Japanese publication JP 2010-31833 publication
Patent documentation 2: Japanese publication JP 2011-163250 publication
Summary of the invention
The problem that invention will solve
The present invention completes to solve the problem, its object is to provide waste gas cleaning system and exhaust gas purifying method, the low-temperature characteristics of the waste gas cleaning plant possessing prime oxidation catalyst (DOC) and the side at least in NOx purification catalyst or DPF can be improved, the NOx conversion characteristic of NOx purification catalyst to low temperature waste gas can be improved, can prevent HC when being regenerated by NOx purification during low temperature, NOx regeneration, PM from leaking the generation of the white cigarette caused.
For solving the means of problem
For realizing the waste gas cleaning system of above-mentioned purpose be, the exhaust passageway of internal-combustion engine is arranged and possesses prime oxidation catalyst, and the waste gas cleaning plant of a side at least in NOx purification catalyst or DPF, and possess the control gear that the running of above-mentioned internal-combustion engine is controlled, wherein, on the above-mentioned exhaust passageway of above-mentioned waste gas cleaning plant upstream side, the first exhaust gas temperature sensor is configured successively from upstream side, front-located oxidation catalyst and the second exhaust gas temperature sensor, above-mentioned control gear is configured to, be implemented as follows first controls: when the first temperature detected by above-mentioned first exhaust gas temperature sensor is lower than the first setting temperature preset, stepped heating injection is carried out in in-cylinder combustion controls, if above-mentioned first temperature becomes more than above-mentioned first setting temperature, spray after then carrying out on the basis that above-mentioned stepped heating sprays, feedback control is carried out to above-mentioned rear injection, the second setting temperature preset is become to make the second temperature detected by above-mentioned second exhaust gas temperature sensor.
According to this formation, make the waste gas more at higher temperature than the waste gas flowed into towards prime oxidation catalyst, flow into the waste gas cleaning plant than possessing prime oxidation catalyst (DOC) and the side at least in NOx purification catalyst or DPF, the front-located oxidation catalyst (Pre-DOC) of configuration near (in cylinder) in the cylinder of upstream side, and easily form with activating, therefore can be oxidized efficiently by this front-located oxidation catalyst and be sprayed by stepped heating in cylinder and do not fire HC the waste gas that flows out in cylinder, can prevent HC from leaking, and waste gas can be made efficiently by the oxidation heat of the HC be oxidized by front-located oxidation catalyst, prime oxidation catalyst, NOx purification catalyst, and the intensification such as DPF, the raising of NOx removal can be realized, the validation of dpf regeneration.
This front-located oxidation catalyst is mainly used in being oxidized discharging HC, CO tightly in cylinder, as long as can when the operating condition of internal-combustion engine be idling mode, low load exhaust gas temperature lower and exhausted air quantity is less, play the intensification function of waste gas, therefore, it is possible to realize miniaturization.Such as, about capacity, 100000/h (hr can be become by the SV value of spatial velocity -1) the such small-sized oxidation catalyst of degree formed.
This front-located oxidation catalyst can become small-sized, therefore, it is possible to arrange close to the engine main body of internal-combustion engine as far as possible.In addition, by means of only this front-located oxidation catalyst, cannot cover the whole region of the operation range of internal-combustion engine, the scope that cannot cover is covered by prime oxidation catalyst (DOC).Therefore, the prime oxidation catalyst of waste gas cleaning plant is also needed.
And, in this formation, first, in cylinder, carry out stepped heating injection, rear injection, by front-located oxidation catalyst, the HC in the waste gas of discharging in cylinder be oxidized and make the temperature of waste gas.That is, by stepped heating injection, front-located oxidation catalyst being warming up to more than catalyst activation temperature ahead of time, after this intensification, to being oxidized by the rear HC spraying supply, waste gas being heated up by front-located oxidation catalyst.Thereby, it is possible to make the prime oxidation catalyst of waste gas cleaning plant heat up.
In this case, can be arranged on and heat up close to the position of engine main body, small-sized and thermal capacity is less front-located oxidation catalyst very in advance, and become more than catalyst activation temperature, even if therefore also HC can be oxidized efficiently from period very early when cold-starting.In addition, said stepped heating sprays herein is the cylinder fuel injection be made up of pre-spray, main injection and delayed injection.
In above-mentioned waste gas cleaning system, possess above-mentioned NOx purification catalyst and form above-mentioned waste gas cleaning plant, in above-mentioned control gear, above-mentioned first setting temperature is set as the catalyst activation temperature of above-mentioned front-located oxidation catalyst, above-mentioned second setting temperature is set as the temperature that the catalyst activity of above-mentioned NOx purification catalyst is good, and above-mentioned control gear is configured to, when the cooling water temperature of above-mentioned internal-combustion engine is lower than the cooling water setting temperature preset, implement above-mentioned first to control, if by implementing above-mentioned first control, above-mentioned second temperature can maintain above-mentioned second setting temperature, then implement the control terminating the injection of above-mentioned stepped heating and above-mentioned rear injection.
In addition, the temperature that the catalyst activity of this NOx purification catalyst is good, refers to more than the catalyst activation temperature of NOx purification catalyst, a temperature in temperature range that NOx removal is higher.Such as, be temperature that NOx removal is the highest, NOx removal to be in permissible range and the highly preferred temperature of viewpoint etc. in life-span from NOx purification catalyst.
According to this formation, when the cold starting of internal-combustion engine, cold state or heat engine state is judged according to cooling water temperature, under a cold state, controlled by front-located oxidation catalyst and first, can prevent the HC likely produced because stepped heating sprays from leaking, therefore, it is possible to carry out stepped heating injection from cold, controlled by first during cold, heating up ahead of time of waste gas, prime oxidation catalyst and NOx purification catalyst can be carried out, the NOx removal of NOx purification catalyst can be improved.
In addition, in above-mentioned waste gas cleaning system, possess above-mentioned DPF and form above-mentioned waste gas cleaning plant, and on the above-mentioned exhaust passageway than above-mentioned DPF upstream side, configuration outlet pipe fuel injection device and the 3rd exhaust gas temperature sensor that the temperature of the waste gas flowed into towards above-mentioned DPF is detected, in above-mentioned control gear, above-mentioned first setting temperature is set as the catalyst activation temperature of above-mentioned front-located oxidation catalyst, second setting temperature is set as the temperature of the fuel decomposition of spraying from above-mentioned outlet pipe fuel injection device, 3rd setting temperature is set as the temperature that the particle-like substance that above-mentioned DPF traps can burn, and above-mentioned control gear is configured to, implement above-mentioned first to control when the low load of above-mentioned internal-combustion engine, if by implementing above-mentioned first control, above-mentioned second temperature can maintain above-mentioned second setting temperature, then start from above-mentioned outlet pipe fuel injection device burner oil, feedback control is carried out to above-mentioned rear injection, above-mentioned 3rd setting temperature is become to make the 3rd temperature detected by above-mentioned 3rd exhaust gas temperature sensor, the whether burned removing of particle-like substance that above-mentioned DPF traps is judged in the enforcement of this feedback control, when being judged to be the burned removing of particle-like substance that above-mentioned DPF traps, implement the control terminating the injection of above-mentioned stepped heating and above-mentioned rear injection.
According to this formation, controlled by front-located oxidation catalyst and first, when the PM of the DPF when the operating condition of internal-combustion engine is low load condition regenerates, can prevent the HC likely produced because stepped heating sprays from leaking, even if also can stepped heating injection be carried out when low load, control to make the temperature of waste gas arrive the temperature of the fuel decomposition of being sprayed by outlet pipe fuel injection system ahead of time by first, the preventing effectiveness that HC leaks can be obtained, meanwhile, the facilitation effect of intensification during the PM regeneration of DPF can be obtained, DPF can be made to heat up ahead of time, PM can be removed efficiently.
In addition, this front-located oxidation catalyst effect when combining with outlet pipe fuel injection device becomes larger.Namely, due in order to make the fuel gasification of injection need the regular hour, therefore need to expand the interval between outlet pipe fuel injection device and prime oxidation catalyst, such as become more than 1m, and prime oxidation catalyst is configured at the position away from engine main body, but the front-located oxidation catalyst be configured at than outlet pipe fuel injection device upstream side, close to engine main body, and flow into the waste gas of the high temperature of discharging in cylinder, therefore when needing the intensification of the waste gas flowed into towards waste gas cleaning plant, front-located oxidation catalyst can be warming up to more than catalyst activation temperature ahead of time, can be oxidized by the rear HC spraying supply ahead of time, therefore, it is possible to make waste gas promptly heat up.
And, for realizing the exhaust gas purifying method of above-mentioned purpose be, make the waste gas of discharging from internal-combustion engine by possessing prime oxidation catalyst, and the waste gas cleaning plant of a side at least in NOx purification catalyst or DPF purifies, the feature of this exhaust gas purifying method is, make above-mentioned waste gas after by front-located oxidation catalyst by above-mentioned waste gas cleaning plant, and be implemented as follows first controls: when the first temperature that the first exhaust gas temperature sensor by above-mentioned waste gas cleaning plant upstream side detects is lower than the first setting temperature preset, stepped heating injection is carried out in in-cylinder combustion controls, if above-mentioned first temperature becomes more than above-mentioned first setting temperature, spray after then carrying out on the basis that above-mentioned stepped heating sprays, feedback control is carried out to above-mentioned rear injection, the second setting temperature preset is become to make the temperature detected by second exhaust gas temperature sensor in above-mentioned waste gas cleaning plant downstream side.
According to the method, make the waste gas more at higher temperature than the waste gas flowed into towards prime oxidation catalyst, flow into than possessing prime oxidation catalyst (DOC), and the waste gas cleaning plant of a side at least in NOx purification catalyst or DPF, the front-located oxidation catalyst (Pre-DOC) of the neighbouring configuration of (in cylinder) in the cylinder of upstream side, and easily form with activating, therefore can be oxidized efficiently by this front-located oxidation catalyst and be sprayed by stepped heating in cylinder and do not fire HC the waste gas that flows out in cylinder, can prevent HC from leaking, and waste gas can be made efficiently by the oxidation heat of the HC be oxidized by front-located oxidation catalyst, prime oxidation catalyst, NOx purification catalyst, and the intensification such as DPF, the raising of NOx removal can be realized, the validation of dpf regeneration.
In above-mentioned exhaust gas purifying method, make above-mentioned waste gas by possessing the above-mentioned waste gas cleaning plant of above-mentioned NOx purification catalyst, and above-mentioned first setting temperature is set as the catalyst activation temperature of above-mentioned front-located oxidation catalyst, above-mentioned second setting temperature is set as the temperature that the catalyst activity of above-mentioned NOx purification catalyst is good, and, control lower than implementing above-mentioned first during the cooling water setting temperature preset at the cooling water temperature of above-mentioned internal-combustion engine, if by implementing above-mentioned first control, above-mentioned second temperature can maintain above-mentioned second setting temperature, then terminate above-mentioned stepped heating to spray and above-mentioned rear injection.
According to the method, when the cold starting of internal-combustion engine, cold state or heat engine state is judged according to cooling water temperature, under a cold state, controlled by front-located oxidation catalyst and first, can prevent the HC likely produced because stepped heating sprays from leaking, therefore, it is possible to carry out stepped heating injection from cold, controlled by first during cold, heating up ahead of time of waste gas, prime oxidation catalyst and NOx purification catalyst can be carried out, the NOx removal of NOx purification catalyst can be improved.
In addition, in above-mentioned exhaust gas purifying method, make above-mentioned waste gas by possessing the above-mentioned waste gas cleaning plant of above-mentioned DPF, and above-mentioned first setting temperature is set as the catalyst activation temperature of above-mentioned front-located oxidation catalyst, above-mentioned second setting temperature is set as the temperature of the fuel decomposition of spraying from above-mentioned outlet pipe fuel injection device, 3rd setting temperature is set as the temperature that the particle-like substance that above-mentioned DPF traps can burn, and above-mentioned first control is implemented when the low load of above-mentioned internal-combustion engine, and if by implementing above-mentioned first control, above-mentioned second temperature can maintain above-mentioned second setting temperature, then from the above-mentioned outlet pipe fuel injection device being arranged at above-mentioned waste gas cleaning plant upstream, fuel sprays, feedback control is carried out to above-mentioned rear injection, above-mentioned 3rd setting temperature is become to make the 3rd temperature detected by above-mentioned 3rd exhaust gas temperature sensor being configured at above-mentioned DPF upstream, the whether burned removing of particle-like substance that above-mentioned DPF traps is judged in the enforcement of this feedback control, when being judged to be the burned removing of particle-like substance that above-mentioned DPF traps, terminate above-mentioned stepped heating to spray and above-mentioned rear injection.
According to the method, controlled by front-located oxidation catalyst and first, when the PM of the DPF when the operating condition of internal-combustion engine is low load condition regenerates, can prevent the HC likely produced because stepped heating sprays from leaking, even if also can stepped heating injection be carried out when low load, control to make the temperature of waste gas arrive the temperature of the fuel decomposition of being sprayed by outlet pipe fuel injection device ahead of time by first, the preventing effectiveness that HC leaks can be obtained, meanwhile, the facilitation effect of intensification during the PM regeneration of DPF can be obtained, DPF can be made to heat up ahead of time, PM can be removed efficiently.
The effect of invention
According to waste gas cleaning system of the present invention and exhaust gas purifying method, adopt the configuration that front-located oxidation catalyst is set in the upstream of the waste gas cleaning plant possessing prime oxidation catalyst and the side at least in NOx purification catalyst or DPF, and control to control stepped heating injection and rear injection by first, thus when waste gas is low temperature, the intensification of waste gas, prime oxidation catalyst, NOx purification plant and DPF etc. can be realized ahead of time, NOx purification, NOx regeneration, dpf regeneration can be carried out efficiently.
Accompanying drawing explanation
Fig. 1 is the figure of the formation of the waste gas cleaning system representing the first mode of execution of the present invention.
Fig. 2 is the figure representing the first control of the present invention and the second flow process controlled.
Fig. 3 is the figure representing the first control of the present invention and the 3rd flow process controlled.
Fig. 4 is the figure of the formation of the waste gas cleaning system representing the second mode of execution of the present invention.
Fig. 5 is the figure of the formation of the waste gas cleaning system representing the 3rd mode of execution of the present invention.
Fig. 6 is the figure of the formation of the waste gas cleaning system representing the 4th mode of execution of the present invention.
Fig. 7 be represent in embodiment and conventional example, the figure of the time series of temperature of exit position of front-located oxidation catalyst and seasonal effect in time series one example of the NOx concentration of the exit position of NOx purification catalyst.
Embodiment
Below, with reference to accompanying drawing, the waste gas cleaning system of embodiments of the present invention and exhaust gas purifying method are described.
Fig. 1 represents the formation of the waste gas cleaning system 1 of the first mode of execution of the present invention.
This waste gas cleaning system 1 is the system for purifying the waste gas G of motor (internal-combustion engine) 10, this motor 10 is configured to, and has engine main body 11, the inlet air pathway 12 be connected with the intake manifold 11a of this engine main body 11, the exhaust passageway 16 be connected with the gas exhaust manifold 11b of engine main body 11 and the EGR passage 18 connecting exhaust passageway 16 and inlet air pathway 12.
On the inlet air pathway 12 that air inlet A passes through, air inflow sensor (MAF) 13, the compressor 17a of turbo-type supercharger 17, interstage cooler 14 and intake valve 15 etc. is equipped successively from upstream side, in addition, on the exhaust passageway 16 that waste gas G passes through, from upstream side, be equipped with turbine 17b, HC jet nozzles (outlet pipe fuel injection device) 24 and waste gas cleaning plant 20 etc. of turbo-type supercharger 17 successively.Further, in the EGR passage 18 that EGR gas Ge passes through, from upstream side, cooler for recycled exhaust gas 18a and EGR valve 18b is equipped with successively.
In addition, waste gas cleaning plant 20 is configured to, and possesses prime oxidation catalyst (DOC) 21, DPF (diesel particulate filter) 22 and NOx purification catalyst (deNOx catalyzer) 23 from upstream side successively.As this NOx purification catalyst 23, NOx storage-reduction catalyst (LNT catalyzer), selective reduction type catalyzer (SCR catalyst) etc. can be used.
In the present invention, in the waste gas cleaning system 1 of this Fig. 1, small-sized front-located oxidation catalyst (Pre-DOC) 25 is configured between turbine 17b and HC jet nozzles 24, by this front-located oxidation catalyst 25, the hydrocarbon (HC) flowing out (leakage) in cylinder is oxidized, by the oxidation heat of this hydrocarbon, waste gas is heated up.
The capacity of this small-sized front-located oxidation catalyst 25 is set to following capacity: the operating condition of motor 10 from idle state to the exhaust gas flow of low load operating state within the scope of, generally become can guarantee catalyst activity and the scope that can be oxidized HC efficiently such, the SV value of spatial velocity becomes 100000/h (hr -1) the such capacity of degree.In addition, this spatial velocity is gas flow rate (Nm 3/ h) divided by catalytic amount (m 3) and the value obtained.
On the other hand, the capacity of prime oxidation catalyst 21 is, be formed as following capacity: in the gamut of the operating condition of motor 10, even if also the such capacity of HC can be oxidized efficiently for maximum exhaust gas flow, owing to needing the gamut that can cover operating condition, therefore this prime oxidation catalyst 21 is larger than front-located oxidation catalyst 25.
Conversely, front-located oxidation catalyst 25 can than prime oxidation catalyst 21 miniaturization.And, by this miniaturization, front-located oxidation catalyst 25 can be disposed in than the side of prime oxidation catalyst 21 closer to engine main body 11, therefore before the temperature of the waste gas G discharged in cylinder reduces due to the heat radiation of exhaust passageway 16, the waste gas G of high temperature is made to flow into front-located oxidation catalyst 25, the temperature of front-located oxidation catalyst 25 is maintained more than catalyst activation temperature, and can HC, CO be oxidized.
In addition, the first exhaust gas temperature sensor 26 is configured at the upstream side of front-located oxidation catalyst 25, the second exhaust gas temperature sensor 27 is configured at the downstream side of front-located oxidation catalyst 25.In addition, the 3rd exhaust gas temperature sensor 28 to be configured between the prime oxidation catalyst 21 of waste gas cleaning plant 20 and DPF22, i.e. the upstream of DPF22.
And, be provided with the control gear 30 being called control unit of engine (ECU) of the control carrying out overall engine.This control gear 30 is configured to, input detected by each exhaust gas temperature sensor 26,27,28 temperature T1, T2, T3, the cooling water temperature Tw detected by cooling-water temperature sensor (not shown) and motor 10 rotational speed Ne, load Q, and the cylinder fuel injection of motor 10 to be controlled.
This control gear 30 is configured to, and it controls to comprise following the first control, second and controls and the 3rd control.First controls to be the control relevant to the activation of front-located oxidation catalyst 25, as shown in the control flow of Fig. 2 and Fig. 3, when the first temperature T1 detected by the first exhaust gas temperature sensor 26 is lower than the first setting temperature T1c preset, the stepped heating being undertaken being made up of pre-spray (pilot injection), main injection (main injection) and delayed injection (after injection) by cylinder fuel injection sprays (intensification multi-stage jet).And, this first control is following control: if the first temperature T1 becomes the first more than setting temperature Tc1, (postinjection) is sprayed after then carrying out on the basis that stepped heating sprays, by front-located oxidation catalyst 25 make by rear spray supply do not fire HC oxidation, carry out feedback control in the mode of the second setting temperature T2c making the second temperature T2 detected by the second exhaust gas temperature sensor 27 become to preset.
In this first control, the first setting temperature T1c is set as the catalyst activation temperature (about roughly 200 DEG C) of front-located oxidation catalyst 25.Thus, can be sprayed by stepped heating before front-located oxidation catalyst 25 activates makes waste gas G heat up, by the waste gas G of this intensification, front-located oxidation catalyst 25 is heated up, after front-located oxidation catalyst 25 is warming up to more than catalyst activation temperature, make to be oxidized by the rear HC spraying supply by the catalyst action of front-located oxidation catalyst 25 and waste gas G is heated up, the second temperature T2 of waste gas G can be made to become the second setting temperature Tc2 of the requirement of the waste gas cleaning plant 20 meeting front-located oxidation catalyst 25 downstream side.
In addition, second control is the control of NOx purification catalyst 23, following control: as shown in the control flow of Fig. 2, whether lower than the cooling water setting temperature Twc preset (such as to judge the temperature Tw of the cooling water of motor 10, water temperature 40 DEG C), when being judged to be low, be set to and be in cold state, and implement the first control, and if control by first and the second temperature T2 can maintain the second setting temperature T2c, then be set to and become heat engine state from cold state, and terminate stepped heating injection and rear injection.In this second control, the second setting temperature T2c is set as the catalyst activation temperature (about roughly 300 DEG C) of NOx purification catalyst 23.
In addition, 3rd control is the control of DPF22, following control: as shown in the control flow of Fig. 3, whether the operating condition of judgement motor 10 is the low load conditions preset, implement first to control when being judged to be low load condition, and if control by first and the second temperature T2 can maintain the second setting temperature T2c, then start from HC jet nozzles 24 burner oil F, and carry out feedback control in the mode making the 3rd temperature T3 detected by the 3rd exhaust gas temperature sensor 28 become the 3rd setting temperature T3c, the whether burned removing of PM (particle-like substance) that DPF22 traps is judged in the enforcement of this feedback control, when being judged to be the burned removing of PM, terminate stepped heating to spray and rear injection.In controlling the 3rd, second setting temperature Tc2 is set as the temperature (about roughly 300 DEG C) that the fuel F sprayed from HC jet nozzles 24 decomposes the 3rd setting temperature Tc3 is set as the temperature (roughly 500 DEG C ~ about 600 DEG C) that the PM that DPF22 traps can burn.
Then, the exhaust gas purifying method of above-mentioned waste gas cleaning system 1 is described.As this exhaust gas purifying method, the method for the control of the regeneration of the method that there is the control of the NOx purification catalyst 23 of " first controls+the second controls " of carrying out as shown in Figure 2 and the DPF22 carrying out " first controls+the three controls " as shown in Figure 3.Fig. 2 and Fig. 3 illustrates its control flow, but the control flow that the control flow of this Fig. 2 and Fig. 3 is expressed as: while motor 10 starts, recall from upper control flow as required, implementation step S11 ~ step S22 or step S11 ~ step S33, and return upper control flow, repeatedly perform this situation as required, when motor 10 stops, terminating together with upper control flow.
The method of NOx purification catalyst 23, being the method for the NOx removal for improving the NOx purification catalyst 23 after cold starting tightly, implementing the method at the temperature Tw of the cooling water of motor 10 lower than during the cooling water setting temperature Twc preset.In the method, first setting temperature T1c is set as the catalyst activation temperature (about roughly 200 DEG C) of front-located oxidation catalyst 25, the second setting temperature T2c is set as the temperature (about roughly 300 DEG C) that the catalyst activity of NOx purification catalyst 23 is good.
The method makes the waste gas G discharged from motor 10 be carried out the exhaust gas purifying method that purifies by the waste gas cleaning plant 20 possessing prime oxidation catalyst 21 and NOx purification catalyst 23, makes waste gas G before by waste gas cleaning plant 20 by front-located oxidation catalyst 25.
Meanwhile, according to control flow as shown in Figure 2, judge the first temperature T1 of being detected by the first exhaust gas temperature sensor 26 of waste gas cleaning plant 20 upstream side in step s 11 whether as the first more than the setting temperature T1c preset, when low (no), in step s 12, implement by pre-spray in in-cylinder combustion controls, the stepped heating that main injection and delayed injection are formed sprays, in the judgement of step S11, (YES) when first temperature T1 becomes the first more than setting temperature T1c, implement the rear spraying fire sprayed after carrying out on the basis of stepped heating injection in step s 13.In this rear spraying fire, in the mode of the second setting temperature T2c making the temperature T2 detected by second exhaust gas temperature sensor 27 in waste gas cleaning plant 20 downstream side become to preset, feedback control is carried out to rear injection.This step S11 to step S13 becomes the first control (step S10).
Then, in step S21 after step s 13, judge whether the second temperature T2 becomes by the first control and can maintain the second setting temperature T2c, when maintaining (no), turn back to step S13, can (YES) be maintained if become, then advance towards step S22, terminate stepped heating and spray and rear injection.This step S21 and S22 becomes the second control (step S20).In addition, such as, by the second temperature T2 time whether sustainable existence presets in the scope of the set point of temperature width preset centered by the second setting temperature T2c with first-class, can judge whether the second temperature T2 can maintain the second setting temperature T2c.
That is, when the temperature Tw of the cooling water of motor 10 is the cold of cooling water setting temperature (such as, 40 DEG C) below Twc, start multi-stage jet and control and waste gas G is heated up.This stepped heating is ejected through the spraying fire than usual delayed injection (retard), After Top Center carry out pre-spray, main injection, delayed injection continuously, make the burning in cylinder continue and be exhausted when in-cylinder combustion temperature is remained high temperature, make the temperature of waste gas G.When this stepped heating sprays, the concentration of HC, CO in waste gas G uprises, but can be undertaken adsorbing or being oxidized by front-located oxidation catalyst 25, therefore, it is possible to purification HC, CO.
In addition, if the first temperature T1 of the waste gas G of front-located oxidation catalyst 25 upstream side reaches catalyst activation temperature (about roughly 200 DEG C) the i.e. first setting temperature T1c of front-located oxidation catalyst 25, spray after then adding further, carry out the intensification of front-located oxidation catalyst 25, and become good temperature (about roughly 300 DEG C) the i.e. mode of the second setting temperature T2c of the catalyst activity of NOx purification catalyst 23 with the second temperature T2 of the waste gas G making front-located oxidation catalyst 25 downstream, carry out feedback control.
Then, heat engine (hot gas) progress of motor 10, the second temperature T2 of waste gas G rises, even if if do not carry out stepped heating injection, rear injection, the second temperature T2 of waste gas G also keeps the temperature (about roughly 300 DEG C) that the catalyst activity of NOx purification catalyst 23 is good, then finishing control.
According to the method, there is following advantage: than usually early making NOx purification catalyst 23 heat up, and NOx removal can be improved.
On the other hand, the method for the regeneration of DPF22 is the method for the dpf regeneration for promoting DPF22, implements the method when the operating condition of motor 10 is the low load condition preset.In the method, the first setting temperature T1c is set as the catalyst activation temperature of prime oxidation catalyst 25, the second setting temperature T2c is set as that the fuel F sprayed from HC jet nozzles 24 carries out the temperature of decomposing.
The method makes the waste gas G discharged from motor 10 be carried out the exhaust gas purifying method that purifies by the waste gas cleaning plant 20 possessing prime oxidation catalyst 21 and DPF22, makes waste gas G before by waste gas cleaning plant 20 by front-located oxidation catalyst 25.
Meanwhile, according to control flow as shown in Figure 3, judge that whether the first temperature T1 detected by the first exhaust gas temperature sensor 26 of waste gas cleaning plant 20 upstream side is lower than the first setting temperature T1c preset in step s 11, when low (no), in step s 12, control to implement by pre-spray by in-cylinder combustion, the stepped heating that main injection and delayed injection are formed sprays, in the judgement of step S11, (YES) when first temperature T1 becomes the first more than setting temperature T1c, implement the rear spraying fire sprayed after carrying out on the basis of stepped heating injection in step s 13.In this rear injection, in the mode of the second setting temperature T2c making the second temperature T2 detected by second exhaust gas temperature sensor 27 in waste gas cleaning plant 20 downstream side become to preset, feedback control is carried out to rear injection.This step S11 to step S13 becomes the first control (step S10).
Then, in step S31 after step s 13, judge to control by first and whether the second temperature T2 can maintain the second setting temperature T2c, when maintaining (no), turn back to step S13, when become can maintain (YES), pipe fuel injection is exhausted in step s 32 from the HC jet nozzles 24 being arranged at waste gas cleaning plant 20 upstream, in the mode making the 3rd temperature T3 detected by the 3rd exhaust gas temperature sensor 28 being configured at DPF22 upstream become the 3rd setting temperature T3c, feedback control is carried out to rear injection.
In step S33 afterwards, in the enforcement of this feedback control, judge the whether burned removing of PM (particle-like substance) that DPF22 traps, when be judged to be PM that DPF22 traps not burned removing (no), turn back to step S32, the (YES) when being judged to be PM that DPF22 traps burned removing, in step S34 afterwards, terminates stepped heating and sprays and rear injection.This step S31 to step S34 becomes the 3rd and controls (step S30).
Can by the total time of outlet pipe fuel injection and recovery time whether have passed through preset the regeneration object time, DPF22 front and back differential pressure value whether to become differential pressure target value such as the following, judge the whether burned removing of this PM.
That is, when starting PM regeneration when low load, start stepped heating and spray and waste gas G is heated up.When stepped heating sprays, the concentration of HC, CO of waste gas G uprises, but can be undertaken adsorbing and being oxidized and purifying HC, CO by small-sized front-located oxidation catalyst 25.
If the first temperature T1 of the waste gas G of front-located oxidation catalyst 25 upstream reaches catalyst activation temperature (about roughly 200 DEG C) the i.e. first setting temperature T1c of front-located oxidation catalyst 25, spray after then adding further, be oxidized by this rear HC that do not fire spraying supply by front-located oxidation catalyst 25, and the intensification carrying out front-located oxidation catalyst 25 by this oxidation heat and the intensification of waste gas G passed through in this front-located oxidation catalyst 25, and become with the second temperature T2 of the waste gas G making front-located oxidation catalyst 25 downstream the fuel F sprayed from HC jet nozzles 24 and carry out temperature (about roughly 300 DEG C) the i.e. mode of the second setting temperature T2c of decomposing, carry out feedback control.
Then, be exhausted pipe fuel injection, by prime oxidation catalyst 21, the fuel F supplied by this outlet pipe fuel injection is oxidized, and the intensification carrying out prime oxidation catalyst 21 by this oxidation heat and the intensification of waste gas G passed through in this prime oxidation catalyst 21, by the waste gas G after this intensification, DPF22 is heated up, and regenerate good temperature (roughly 500 DEG C ~ about 600 DEG C) the i.e. mode of the 3rd setting temperature T3c to make the 3rd temperature T3 of the waste gas G of DPF22 upstream become PM, carry out feedback control.This is feedback controlled to, if be judged as the burned removing of PM, finishing control.
As the advantage of the method, than the intensification usually early carrying out DPF22, and the effect preventing from being leaked the white cigarette caused by HC during outlet pipe fuel injection can be had.
According to above-mentioned waste gas cleaning system 1 and exhaust gas purifying method, become by prime oxidation catalyst 21, the upstream of the waste gas cleaning plant 20 that DPF22 and NOx purification catalyst 23 are formed arranges small-sized front-located oxidation catalyst 25, the configuration of HC jet nozzles 24 is set in downstream, by spraying stepped heating, rear injection, and outlet pipe fuel injection etc. controls, HC when being sprayed by front-located oxidation catalyst 25 pairs of stepped heatings is thus adsorbed and is oxidized, can prevent HC from leaking thus, stepped heating injection can be carried out from during cold, therefore, it is possible to the effect that the NOx removal of waste gas when obtaining cold improves.
Equally, reduce HC during dpf regeneration in low load condition to leak, and temperature i.e. the second setting temperature T2c that the fuel F second temperature T2 of waste gas G being heated up ahead of time and makes it arrive ahead of time to spray from the HC jet nozzles 24 in downstream decomposes, the temperature rise effect ahead of time when can obtain dpf regeneration thus and HC leakage preventing effectiveness.
Then, the waste gas cleaning system 1A of the second mode of execution shown in Fig. 4 is described.In the waste gas cleaning system 1A of this second mode of execution, waste gas cleaning plant 20A is configured to, and is configured with prime oxidation catalyst 21, NOx purification catalyst 23 and DPF22 from upstream side.That is, be with the difference of the waste gas cleaning system 1 of the first mode of execution, NOx purification catalyst 23 is configured at than DPF22 upstream side.In addition, comprise control gear 30 and comprise the first control, second and control and the 3rd to control and situation about forming, all identical with the waste gas cleaning system 1 of the first mode of execution and exhaust gas purifying method, and identical action effect can be played.
Then, the waste gas cleaning system 1B of the 3rd mode of execution shown in Fig. 5 is described.In the waste gas cleaning system 1B of the 3rd mode of execution, waste gas cleaning plant 20B is configured to, and is configured with prime oxidation catalyst 21 and NOx purification catalyst 23 from upstream side.That is, be not there is DPF22 this point and control gear 30 and be configured to comprise the first control and second and control but do not comprise the 3rd to control this point with the difference of the waste gas cleaning system 1 of the first mode of execution.Other form identical with the waste gas cleaning system 1 of the first mode of execution and exhaust gas purifying method, and can obtain controlling based on first and the second action effect controlled.
Then, the waste gas cleaning system 1C of the 4th mode of execution shown in Fig. 6 is described.In the waste gas cleaning system 1C of the 4th mode of execution, waste gas cleaning plant 20C is configured to, and is configured with prime oxidation catalyst 21 and DPF22 from upstream side.That is, be not there is NOx purification catalyst 23 this point and control gear 30 and be configured to comprise the first control and the 3rd and control but do not comprise the second control this point with the difference of the waste gas cleaning system 1 of the first mode of execution.Other form identical with the waste gas cleaning system 1 of the first mode of execution and exhaust gas purifying method, and can obtain controlling based on first and the 3rd action effect controlled.
Fig. 7 represents the embodiment A of having carried out the first control and the second control in the waste gas cleaning system 1 of the first mode of execution and the experimental result of not carrying out the first control and the second comparative example B controlled.The catalyst temperature (DEG C) of Fig. 7 hypomere is the temperature of the exit position of front-located oxidation catalyst (Pre-DOC) 25, known: in comparative example B, to arrive 200 DEG C of needs 900s (second), on the other hand, in embodiment A, arrive 200 DEG C when 300s, the intensification facilitation effect being controlled the waste gas G brought by front-located oxidation catalyst 25 and first is larger.
In addition, the catalyst outlet NOx concentration of Fig. 7 epimere is the NOx concentration (ppm) of the exit position of NOx purification catalyst 23, known: compared with not carrying out the comparative example B of stepped heating injection, in the embodiment A of carrying out stepped heating injection, NOx concentration significantly diminishes.
Utilizability in industry
Waste gas cleaning system of the present invention and exhaust gas purifying method, can improve the low-temperature characteristics of the waste gas cleaning plant possessing prime oxidation catalyst (DOC) and the side at least in NOx purification catalyst or DPF, and the NOx conversion characteristic of NOx purification catalyst to low temperature waste gas can be improved, and can prevent from being purified by NOx during low temperature, HC when NOx regenerates, PM regenerates leaks the generation of the white cigarette caused, therefore, it is possible to be used as the waste gas cleaning system of the internal-combustion engine such as diesel engine of automobile lift-launch and exhaust gas purifying method.
The explanation of symbol
1,1A, 1B, 1C waste gas cleaning system
10 motors (internal-combustion engine)
16 exhaust passageways
20,20A, 20B, 20C waste gas cleaning plant
21 prime oxidation catalysts (DOC)
22 DPF
23 NOx purification catalyst
24 HC jet nozzless (outlet pipe fuel injection device)
25 front-located oxidation catalysts (Pre-DOC)
26 first exhaust gas temperature sensors
27 second exhaust gas temperature sensors
28 the 3rd exhaust gas temperature sensors
30 control gear (ECU)
F hydrocarbon (HC; Light oil; Fuel)
G waste gas
First temperature of T1 waste gas
Second temperature of T2 waste gas
3rd temperature of T3 waste gas
T1c first setting temperature
T2c second setting temperature
T3c the 3rd setting temperature
The temperature of Tw cooling water
Twc cooling water setting temperature

Claims (6)

1. a waste gas cleaning system, the exhaust passageway of internal-combustion engine arranges the waste gas cleaning plant possessing prime oxidation catalyst and the side at least in NOx purification catalyst or DPF, and possess the control gear that the running of described internal-combustion engine is controlled, it is characterized in that
On the described exhaust passageway of described waste gas cleaning plant upstream side, from upstream side, configure the first exhaust gas temperature sensor, front-located oxidation catalyst and the second exhaust gas temperature sensor successively,
Described control gear is configured to, be implemented as follows first controls: when the first temperature detected by described first exhaust gas temperature sensor is lower than the first setting temperature preset, stepped heating injection is carried out in in-cylinder combustion controls, if described first temperature becomes more than described first setting temperature, spray after then carrying out on the basis that described stepped heating sprays, feedback control is carried out to described rear injection, becomes to make the second temperature detected by described second exhaust gas temperature sensor the second setting temperature preset.
2. waste gas cleaning system as claimed in claim 1, is characterized in that,
Possess described NOx purification catalyst and form described waste gas cleaning plant, in described control gear, described first setting temperature is set as the catalyst activation temperature of described front-located oxidation catalyst, described second setting temperature is set as the temperature that the catalyst activity of described NOx purification catalyst is good
And, described control gear is configured to, when the temperature of the cooling water of described internal-combustion engine is lower than the cooling water setting temperature preset, implement described first to control, if by implementing described first control, described second temperature can maintain described second setting temperature, then implement the control terminating the injection of described stepped heating and described rear injection.
3. waste gas cleaning system as claimed in claim 1, is characterized in that,
Possess described DPF and form described waste gas cleaning plant, and on the described exhaust passageway than described DPF upstream side, configuration outlet pipe fuel injection device and the 3rd exhaust gas temperature sensor that the temperature of the waste gas flowed into towards described DPF is detected, in described control gear, described first setting temperature is set as the catalyst activation temperature of described front-located oxidation catalyst, second setting temperature is set as the temperature of the fuel decomposition of spraying from described outlet pipe fuel injection device, 3rd setting temperature is set as the temperature that the particle-like substance that described DPF traps can burn,
And, described control gear is configured to, implement described first to control when the low load of described internal-combustion engine, if by implementing described first control, described second temperature can maintain described second setting temperature, then start from described outlet pipe fuel injection device burner oil, feedback control is carried out to described rear injection, described 3rd setting temperature is become to make the 3rd temperature detected by described 3rd exhaust gas temperature sensor, the whether burned removing of particle-like substance that described DPF traps is judged in the enforcement of this feedback control, when being judged to be the burned removing of particle-like substance that described DPF traps, implement the control terminating the injection of described stepped heating and described rear injection.
4. an exhaust gas purifying method, is made the waste gas of discharging from internal-combustion engine be purified by the waste gas cleaning plant possessing prime oxidation catalyst and the side at least NOx purification catalyst or DPF, it is characterized in that,
Make described waste gas by described waste gas cleaning plant after by front-located oxidation catalyst,
And, be implemented as follows first controls: when the first temperature that the first exhaust gas temperature sensor by described waste gas cleaning plant upstream side detects is lower than the first setting temperature preset, stepped heating injection is carried out in in-cylinder combustion controls, if described first temperature becomes more than described first setting temperature, spray after then carrying out on the basis that described stepped heating sprays, feedback control is carried out to described rear injection, the second setting temperature preset is become to make the temperature detected by second exhaust gas temperature sensor in described waste gas cleaning plant downstream side.
5. exhaust gas purifying method as claimed in claim 4, is characterized in that,
Make described waste gas by possessing the described waste gas cleaning plant of described NOx purification catalyst, and described first setting temperature is set as the catalyst activation temperature of described front-located oxidation catalyst, described second setting temperature is set as the temperature that the catalyst activity of described NOx purification catalyst is good
And, when the temperature of the cooling water of described internal-combustion engine is lower than the cooling water setting temperature preset, implement described first to control, if by implementing described first control, described second temperature can maintain described second setting temperature, then terminate described stepped heating and spray and described rear injection.
6. exhaust gas purifying method as claimed in claim 4, is characterized in that,
Make described waste gas by possessing the described waste gas cleaning plant of described DPF,
And, described first setting temperature is set as the catalyst activation temperature of described front-located oxidation catalyst, described second setting temperature is set as the temperature of the fuel decomposition of spraying from described outlet pipe fuel injection device, 3rd setting temperature is set as the temperature that the particle-like substance that described DPF traps can burn
Further, implement described first when the low load of described internal-combustion engine and control,
And, if by implementing described first control, described second temperature can maintain described second setting temperature, then start the described outlet pipe fuel injection device burner oil from being arranged at described waste gas cleaning plant upstream, feedback control is carried out to described rear injection, described 3rd setting temperature is become to make the 3rd temperature detected by described 3rd exhaust gas temperature sensor being configured at described DPF upstream, the whether burned removing of particle-like substance that described DPF traps is judged in the enforcement of this feedback control, when being judged to be the burned removing of particle-like substance that described DPF traps, terminate described stepped heating to spray and described rear injection.
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